Cited by 334Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismPeroxisome Proliferator-Activated Receptors

Macrophage-Secreted Factors Impair Human Adipogenesis: Involvement of Proinflammatory State in Preadipocytes

Lacasa, Danièle, Taleb, Soraya, Keophiphath, Mayoura, Miranville, Alexandra, Clement, Karine·2007·Endocrinology

Abstract

Obesity is considered a chronic low-grade inflammatory state. The white adipose tissue produces a variety of inflammation-related proteins whose expression is increased in obese subjects. The nonadipose cell fraction, which includes infiltrated macrophages, is a determinant source of inflammation-related molecules within the adipose tissue. Our working hypothesis is that macrophage infiltration affects fat expansion through a paracrine action on adipocyte differentiation. Human primary preadipocytes were then differentiated in the presence of conditioned media obtained from macrophages differentiated from blood monocytes. Preadipocytes treated by macrophage-conditioned medium displayed marked reduction of adipogenesis as assessed by decreased cellular lipid accumulation and reduced gene expression of adipogenic and lipogenic markers. In addition to this effect, the activation of macrophages by lipopolysaccharides stimulated nuclear factor κB signaling, increased gene expression and release of proinflammatory cytokines and chemokines, and induced preadipocyte proliferation. This phenomenon was associated with increased cyclin D1 gene expression and maintenance of the fibronectin-rich matrix. Anti-TNFα neutralizing antibody inhibits the inflammatory state of preadipocytes positioning TNFα as an important mediator of inflammation in preadipocytes. Strikingly, conditioned media produced by macrophages isolated from human adipose tissue exerted comparable effects with activated macrophages, i.e. decreased adipogenesis and increased inflammatory state in the preadipocytes. These data show that macrophage-secreted factors inhibit the formation of mature adipocytes, suggesting possible role in limiting adipose tissue expansion in humans.

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Authors
Lacasa, D., Taleb, S., Keophiphath, M., Miranville, A., & Clement, K.
Affiliations
  • Inserm (FR)
  • Goethe University Frankfurt (DE)
Venue
Endocrinology
Published
2007-02-01
Volume
148
Issue
2
Pages
868-877
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2121845219
Cited by
334
References
42
Citations by year
2026: 4 · 2025: 3 · 2024: 12 · 2023: 10 · 2022: 12 · 2021: 19 · 2020: 14 · 2019: 10 · 2018: 15 · 2017: 18 · 2016: 19 · 2015: 12 · 2014: 19 · 2013: 22 · 2012: 16
FWCI
17.32
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
Institut National de la Santé et de la Recherche Médicale
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
Keywords
adipogenesis, preadipocytes, obesity, low-grade inflammation, macrophage infiltration, paracrine signaling, TNF-α, NF-κB signaling, lipopolysaccharide, inflammatory cytokines, chemokines, cyclin D1, adipose tissue expansion
MeSH terms
Adipose Tissue, Cell Differentiation, Cells, Cultured, Culture Media, Female, Humans, Inflammation, Lipopolysaccharides, Macrophages, Stem Cells, Signal Transduction, Biomarkers, Gene Expression, Cytokines, NF-kappa B, Adipocytes, Inflammation Mediators, Chemokines, Cyclin D1, Cell Proliferation, Adipogenesis, Lipid Metabolism

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